Have you ever had Sonar instantly shut down and close out once you open a project without any warning or opportunity to capture any type of error?  
 
I have 2 projects that cause Sonar to close once I open them:  no error message, no warning, Sonar just completely exits out.  If I safe start every plugin then my projects will open, and none of the plugins cause a crash.  However, one project has quite a bit to it so it's getting tedious to work around this way every time I open it.  Is there some type of debugging tool I can run to capture what might be causing Sonar to close so quickly?
 
I just upgraded to Komplete 10 and I'm wondering if this is contributing in some way to my issues.  

So, when you upgraded to Komplete 10, it was updating already existing plugs?
 
Try this out if you haven't already: Open all your Komplete programs in standalone so they can correlate all the patches tied to each program. If the patch database is searching when the vst loads, it can kill your host.

Resonant Serpent, thanks for the great suggestion. Komplete 10 was updating already existing plugs and I moved to Battery 4.  I tried your suggestion of opening the programs in standalone to correlate the patches, and my project still closes automatically when I open it.
 
Any other ideas?

I own quite a lot of plugs, and so do others on this forum. If you listed the plugs, I could tell you which ones work for me as a process of elimination. Also, if you have any plugs made with synthmaker, or any free plugs, I would definitely disable those. I'd load it in safe mode, but categorize by manufacturer. Open all NI, but others in safe mode, etc. It may be one type of plug, or it may be a conflict between two. Basically process of elimination at this point. 
 
I have Komplete 10 Ultimate, and all my plugs from NI load without a problem. The free NI plug Replika does not like Sonar, but I've never heard of it causing a crash.